Arsenic removal from alkaline leaching solution using Fe (III) precipitation

The alkaline leaching solution from arsenic-containing gold concentrate contains a large amount of arsenate ions, which should be removed because it is harmful to the production process and to the environment. In this study, conventional Fe (III) precipitation was used to remove arsenic from the lea...

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Bibliographic Details
Published in:Environmental technology 2019-06, Vol.40 (13), p.1714-1720
Main Authors: Wang, Yongliang, Lv, Cuicui, Xiao, Li, Fu, Guoyan, Liu, Ya, Ye, Shufeng, Chen, Yunfa
Format: Article
Language:English
Subjects:
Alkaline leaching
Arsenates
Arsenic
Arsenic precipitates
Arsenic removal
Chemical precipitation
Fe/As ratio
ferric arsenate
Gold
Iron
Leaching
leaching toxicity
pH effects
Pollutant removal
Precipitates
Toxicity
Toxicity testing
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Summary:The alkaline leaching solution from arsenic-containing gold concentrate contains a large amount of arsenate ions, which should be removed because it is harmful to the production process and to the environment. In this study, conventional Fe (III) precipitation was used to remove arsenic from the leaching solution. The precipitation reaction was carried out at the normal temperature, and the effects of pH value and Fe/As ratio on the arsenic removal were investigated. The results show that the removal rate of arsenic is distinctive at different pH values, and the effect is best within the pH range of 5.25-5.96. The removal rate can be further increased by increasing the ratio of Fe/As. When the pH = 5.25-5.96 and Fe/As > 1.8, the arsenic in the solution can be reduced to below 5 mg/L. However, the crystallinity of ferric arsenate is poor, and the particle size is small, most of which is about 1 μm. The leaching toxicity test shows the leaching toxicity of precipitates gradually decreased by the increase of Fe/As. The precipitates can be stored safely as the ratio of Fe/As exceeded 2.5.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2018.1429495